nav
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background-color: #ffffff;
  border-top: 1px solid #3DD689;

nav
 button
    border: 0;
    float: left;
    width: 50%;
    height: 35px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    background-color: #FFF;


nav
 button
   i
    display: block;
    height: 35px;
    line-height: 35px;
    font-size: 16px;
    color: #000000;
    text-align: center;


nav
 button.clickOn
   background-color: #3DD689;


nav
 button.clickOn
  i
   color: #ffffff;

nav
 em
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #ffffff;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -5px;
  margin-top: -5px;
  opacity: 0;


